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' Sylvester Gulch Inclinometers <br />' North of F-Wall: <br />Movement of up to 0.25 inches was been recorded by I-9B down to a depth of 35 feet during the 1~` <br />quarter 2006. This inclinometer will be read during the 3ra quarter to track this displacement. <br />East Central Flank of Substation Slide -Outside Scaro: <br />Significant movement of up to 0.5 feet down to a depth of 25 feet was recorded by I-27 during the <br />2na quarter 2006. Afield inspecfion of this area will be undertaken during the annual review and the <br />inclinometer will be monitored during the 3`a quarter 2006 to track ongoing displacement and <br />determine if remedial activities will be required. <br />Sylvester Gulch Substation: <br />Significant displacements have been measured in inclinometers OS-102 and OS-105 during the 2°a <br />quarter 2006. Displacements of up to 2 inches and 1.5 inches were measured respectively. The <br />displacement in OS-102 is cleazly defined by a sheaz plane that is located approximately 13 feet <br />below the ground surface. Inclinometer OS-105 sheazed off at approximately 23 feet below the <br />ground surface during the remobilization of the original Apri12005 landslide that occurred in the ls` <br />quarter 2006. The sheaz failure of the inclinometer pipe suggests that a displacement of 4 inches <br />was experienced during the landslide at a depth of 23 feet. <br />A number of stabilization alternatives have been proposed to MCC for this location. They aze still <br />under review by mine site personnel. <br />All other inclinometers in Sylvester Gulch showed little displacement during the 2"a quarter 2006. <br />Barr Engineering Company 2n° Quarter 2006 <br />' 06/26-031 Geotechniral Monitoring <br />